JPH02285404A - Synchronous control nc device - Google Patents

Abstract

PURPOSE:To send two kinds signals, i.e. a synchronizing signal and transfer data as one signal by delaying a 2nd synchronizing signal by a specific time and thus generating a 3rd synchronizing signal which varies at the same period and timing with a 1st synchronizing signal. CONSTITUTION:The transfer data TRT are transferred only once in a cycle T of the synchronizing signal FS. For the purpose, the transfer period of the transfer data TRT is matched with the cycle T of the synchronizing signal FS and then the side of a slave unit 20 generates the 2nd synchronizing signal SS which varies from '0' to '1' at the start point of the transfer data TRT. Further, the synchronizing signal SS is delayed properly by a delay circuit 24 to obtain the 3rd synchronizing signal TS which varies at the same period and timing with the 1st synchronizing signal FS of the side of a main unit 10 on the side of the slave unit 20. Consequently, the synchronizing signal and transfer data can be sent as one signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a synchronous control numerical control device, and in particular, it is composed of a plurality of units, among which data is transferred between a main node and a slave unit, The present invention also relates to a numerical control (hereinafter referred to as NG) device that controls a machine without synchronizing each unit with a constant control cycle.

(Prior Art) An NC device has a plurality of units inside, performs data communication between each unit, and controls a machine while synchronizing with a constant control cycle.

A method of data communication and synchronization of the NC device according to the prior art will be explained with reference to FIG.

The NC device is composed of a main unit 10 and a slave unit 20, and the main unit 10 includes a control command circuit 11 that controls the entire NC device, and a control command circuit 11 that operates each unit inside the NC device at a constant control cycle. a synchronization control circuit 12 that outputs a first synchronization signal FS that informs the timing for
A transmission data buffer 13 for storing control data for the control command circuit 11 to instruct other units, and data TD in this transmission data buffer 13 as transfer data T.
It is composed of a transmitting circuit 14 that outputs an external signal as nD. Further, the slave unit 20 receives the first synchronization signal FS from the main unit 10, and also connects a machine control circuit 21 that operates in the same control cycle as the main unit IO to control a machine (not shown), and a machine control circuit 21 that controls the machine (not shown). Transfer data T from lO
It consists of a receiving circuit 22 that receives I'ID and outputs control data CD from the main unit IO to a receiving data buffer 23. The receiving data buffer 23 is used until the machine control circuit 21 becomes necessary for operation. Control data CD is stored.

The operation of this configuration will be explained with reference to the timing diagram of FIG. 4.

The first synchronization signal FS as shown in Fig. 4 (8) is 0°
Using the time point t1 when the temperature changes from ° to °°1゛° as a trigger,
The control command circuit 11 writes the control data to the transmission data buffer 13 as shown in FIG. Transfer data TR
It is sent as D to the slave unit 20 as shown in FIG. 4(C) (state ■). The receiving circuit 22 of the slave unit 20 writes the contents of the transfer data TRD, that is, the control data, to the receiving data buffer 23 as shown in FIG. At time t4 when the value changes from ° to "1", the machine control circuit 21 is in a state where it is ready to read the control data CD from the reception data buffer 23, as shown in (E) of the same figure.
), and at the same time, in the main unit IO, the control command circuit 11 writes the next control data into the transmission data buffer 13 as shown in FIG. From now on, the above-mentioned operation will be repeated.

Here, the transfer data TlID is “
The transfer starts after a certain time delay from the time of change from "0" to "1", but this is the time required for the control command circuit 11 to generate control data according to the control state of the machine. The times T, , 72T3 are not necessarily the same. However, the transfer data TI (D) is
The maximum time Tmax is specified so that the reading of the received data buffer 23 on the slave unit 20 side ends before the synchronization signal FS changes from "0" to "1". A minimum time Tm1n is defined so that the transfer does not start during this period.

(Problem to be Solved by the Invention) As described above, the main unit 10 sends the first synchronization signal FS to the slave unit 20 to notify the synchronization timing,
It is necessary to send two types of signals, transfer data TRD and transfer data TRD for transmitting control commands. Therefore, there are problems in that the number of signal lines inside the NC device increases, space is required for processing the wiring, and the cost of wiring increases.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to transmit two types of signals, a synchronization signal and transfer data, in a single signal in order to solve the above-mentioned drawbacks in the prior art. It is an object of the present invention to provide a synchronous control NG device including a main unit and a slave unit that can perform the following functions.

(Means for Solving the Problems) The present invention provides a synchronous control system that is composed of a plurality of units, performs data operation between a main unit and a slave unit, and controls a machine while each unit is synchronized. The present invention relates to an NG device, and the above object of the present invention is to transfer data from the main unit to the slave unit at the same cycle as a first synchronization signal inside the main unit,
The slave unit extracts a second synchronization signal having the same period as the first synchronization signal based on the data transferred from the main unit, and delays the second synchronization signal for a certain period of time to obtain the second synchronization signal from the first synchronization signal. This is achieved by generating a third synchronization signal that changes at the same period and timing as the synchronization signal, thereby synchronously controlling the main unit and the slave unit at the same period and timing.

(Operation) As is clear from the timing chart of FIG. 4, the transfer data TRD is transferred only once during the period T of the synchronization signal FS. Although the transfer period of the transfer data TRD is not constant in FIG.
Even if the transfer start time of the transfer data TRD is fixed at the time when the first synchronization signal FS changes from "o" to °゛1°゛ within a range not exceeding the maximum time T□8, it will not work. There is no impact. The transfer period of the transfer data TRD is set by the synchronization signal F.
By matching the period T of S, the slave unit 20 side generates a second synchronization signal that changes from "0" to °1 ° at the start of the transfer data TRD, and further delays this synchronization signal appropriately. If so, the main unit l on the slave unit 20 side.

It is possible to obtain a third synchronization signal that changes at the same period and timing as the first synchronization signal FS on the side.

(Example) The present invention will be described in detail with reference to FIG. 1 shown in correspondence with FIG. 3.

The main unit IO includes a control command circuit 11, a synchronization control circuit 12 that outputs a first synchronization signal FS, and a control command circuit 11.
A transmission data buffer 13 stores control data from the transmission data buffer 13, and the data TD of this transmission data buffer 13 is used as transfer data TRT after a time T0 from the time when the first synchronization signal FS changes from 0 to 1. start the transfer,
It is composed of a transmitting circuit 15 that applies pressure to the outside. Further, the slave unit 20 receives the transfer data TIIT and outputs a second synchronization signal SS that changes from "0'° to "1'° at the start of the transfer data TRT, and transmits the contents of the transfer data, that is, the control data. a receiving circuit 22 that receives the signal and outputs it to the reception data buffer 23; and a delay circuit 24 that delays the second synchronizing signal SS and outputs a third synchronizing signal TS that changes at the same timing as the first synchronizing signal FS. , a machine control circuit 21 that receives the third synchronization signal TS and operates in the same control cycle as the main unit 10 to control the machine, and stores control data until the machine control circuit 21 is needed for its operation. It is composed of a receive data buffer 23 for storing data.

In such a configuration, the bending operation will be explained with reference to the timing chart of FIG. 2.

As shown in FIG. 2 (8), the first synchronization signal FS has a period T
, and the first synchronization signal FS is from °0"
Using the time tlo when the value changes to 1'' as a trigger, the control command circuit 11 writes control data to the transmission data buffer 13 within time T. (state A) as shown in the figure ([l).
. At a later time tl+, the transmitting circuit 15 sends the data TD in the transmitting data buffer 13 as transfer data TRT to the slave unit 20 as shown in FIG. 2(C) (state B). The receiving circuit 22 of the slave unit 20 generates a second synchronizing signal SS that changes from 0° to "1" at the same time as the reception of the transfer data TRT starts, that is, at time t, as shown in FIG. 2(D). (state C). Then, the delay circuit 24
The third synchronizing signal TS is generated and output as shown in FIG. 2(E) at time t12, when the synchronizing signal SS is delayed by a time T1° (.TT,) (state D). With the above operation, the third synchronization signal TS is generated at a time T relative to the first synchronization signal FS. +1. . -TO+T-To-T, that is, the signal is delayed by one period, and it appears to be the first synchronization signal FS.
and the third synchronization signal TS have the same period and change at the same timing.

Note that the operation of writing to and reading from the reception data buffer 23 is exactly the same as that of the prior art (Fig. 2 (F)).
, CG)).

(Effects of the Invention) As described above, according to the present invention, it is possible to send a synchronization signal and transfer data using wooden signals, the number of signal lines inside the NG device can be reduced, and the wire processing space and cost can be reduced. It is possible to realize an NC device that suppresses the noise.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is a timing chart showing an example of its operation, FIG. 3 is a block diagram showing an example of a conventional device, and FIG. 4 is a timing chart showing an example of its operation. 10... Main unit, 11... Control command circuit, 12
...Synchronization control circuit, 13...Transmission data buffer,
14.15... Transmission circuit, 20... Slave unit, 2
1... m machine control circuit, 22... receiving circuit, 23...
- Reception data buffer, 24...delay circuit.

Claims (1)

[Claims] 1. In a synchronous control numerical control device that is composed of a plurality of units, data is transferred between the main unit and the slave unit, and each unit synchronizes to control the machine, from the master unit to the slave unit. The data to be transferred to the main unit is transmitted in the same cycle as the first synchronization signal inside the main unit, and the slave unit transmits the second synchronization signal in the same cycle as the first synchronization signal based on the data transferred from the main unit. The main unit and A synchronous control numerical control device characterized in that slave units are synchronously controlled in the same period and at the same timing.